Singular and plural forms

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Across
  1. 1. a switch
  2. 3. a thief
  3. 4. a louse
  4. 8. a sheep
  5. 13. a piece of furniture
  6. 14. a people
  7. 15. a person
  8. 17. a crisis
  9. 18. a tomato
  10. 19. a day
Down
  1. 2. a stimulus
  2. 5. a crossroads
  3. 6. a foot
  4. 7. a baby
  5. 9. a phenomenon
  6. 10. a spacecraft
  7. 11. a criterion
  8. 12. a studio
  9. 16. a chef